A high-temperature super-high-pressure boiler drum post-hanging hoisting construction method

Abstract

The application discloses a kind of high-temperature superhigh-pressure boiler drum temporary hanging hoisting construction method, adopts crawler crane single machine hoisting drum on the outside of boiler, temporary hanging beam is arranged close to the position of crawler crane, and formal hoisting beam is installed at the position far from the crawler crane.Drum is hoisted to the elevation in place, tower crane installs temporary hanging beam in place, and the upper portion of temporary hanging beam and formal hoisting beam adopts 2 root Φ47.5 steel wire rope, and the contact part with drum adopts 2 root Φ34 steel wire rope, and the upper portion adopts four heads of steel wire rope on hoisting beam and four heads of steel wire rope on drum stringing together, to form a rope, so that steel wire rope is evenly stressed.Install formal hoisting beam after temporary hanging is completed, and the final position of drum is completed by crawler crane and chain hoist.The application does not need buffer platform and steel beam in boiler furnace, and installation work of drum hoisting can be carried out after the verticality of each layer of steel frame is accepted;Step-by-step, acceptance mode makes engineering and technical personnel better and more convenient to control various quality elements, and improves construction technology level.

Description

Technical Field

[0001] This invention relates to the field of boiler drum construction technology, and in particular to a method for hoisting and constructing a high-temperature and ultra-high-pressure boiler drum after temporary installation. Background Technology

[0002] As a crucial component connecting the entire boiler steam-water system, the boiler drum's construction progress and quality directly impact the smooth progress of subsequent important work such as heating surface installation, making it one of the key construction projects in boiler engineering. The traditional boiler drum construction method involves using a furnace top winch to hoist the drum at an angle from the furnace bottom to the predetermined installation elevation via a pulley system. Finally, the pulley system is used to move the drum forward to its installation position. This method suffers from several drawbacks: insufficient space in the furnace's hoisting holes prevents the drum from being lifted horizontally, necessitating the slow installation of the furnace platform and crossbeams. Once the hoisting height is reached, a small jack is used to horizontally position it. Furthermore, the drum's dimensions exceed the furnace's dimensions, resulting in an excessively large tilt angle during hoisting and uneven stress on the two winches. The large size and high placement of the drum, the numerous slow-installation furnace platforms and steel frames, and the long construction period all contribute to the difficulties and dangers encountered during the installation process, making it difficult to meet the project's stringent requirements for schedule and quality. Summary of the Invention

[0003] In order to overcome the above-mentioned problems in the existing technology, the present invention proposes a method for hoisting and constructing a high-temperature and ultra-high-pressure boiler drum after temporary installation.

[0004] The technical solution adopted by this invention to solve its technical problem is: a method for hoisting and constructing a high-temperature and ultra-high-pressure boiler drum after temporary installation, comprising the following steps:

[0005] Step 1, crawler crane operating condition selection: Select the length and angle of the crawler crane main boom according to the height of the boiler steel frame; select the length of the crawler crane auxiliary boom according to the position of the steam drum; and determine the crawler crane super-lift counterweight according to the weight of the steam drum.

[0006] Step 2: Assemble the temporary hanging beam system on the ground. Determine the length of the temporary hanging beam based on the distance between the adjacent beams of the steam drum, determine the specifications of the temporary hanging beam based on the stress condition of the temporary hanging beam, and determine the height of the support beam based on the height of the adjacent beams of the steam drum. Fix two steel wire ropes to the temporary hanging beam at the temporary hanging position of the steam drum. Install reinforcing ribs at the temporary hanging position of the steel wire rope and install pads on the upper part of the temporary hanging position of the steel wire rope to distribute the load evenly and facilitate unhooking. Install hook plates on the outside of the pads.

[0007] Step 3: Unload the steam drum onto the ground and move it to the designated location. Fix two steel wire ropes at the temporary attachment point of the steam drum and fold them in half for use. Also, set up a platform passage on top of the steam drum.

[0008] Step 4: Operate the crawler crane to vertically lift the steam drum to the appropriate height, and slowly climb the boom to the predetermined installation position of the steam drum.

[0009] Step 5: Hoist the temporary beam from Step 2. After the temporary beam is hoisted to the predetermined position, weld the supports and diagonal braces of the temporary beam.

[0010] Step 6, Temporary hanging of the steam drum: Connect the steel wire rope on the temporary hanging beam and the steel wire rope on the steam drum together to form a single rope so that the steel wire rope is evenly stressed.

[0011] Step 7: Using a hand-operated hoist in conjunction with a crawler crane, adjust the longitudinal and transverse center lines and elevation of the steam drum to position it. After installing the formal lifting beam, the steam drum is officially positioned.

[0012] In the above-mentioned method for hoisting a high-temperature and ultra-high-pressure boiler drum after temporary hanging, in step 2, reinforcing ribs are installed at the temporary hanging position of the wire rope, and pads are installed above the temporary hanging position of the wire rope to ensure even load distribution and facilitate unhooking.

[0013] In the above-mentioned method for the temporary installation and hoisting of a high-temperature and ultra-high-pressure boiler drum, in step 3, to ensure the hoisting passage of the drum, the boiler is installed slowly, including the right hoisting beam of the drum furnace and the main beam and columns above K1G745.6m.

[0014] The above-mentioned method for the temporary installation and hoisting of a high-temperature and ultra-high-pressure boiler drum involves marking the position on the boiler plate beam before the temporary beam is in place, ensuring that the position does not collide with the formal boiler drum hoisting beam.

[0015] In the above-mentioned method for hoisting a high-temperature and ultra-high-pressure boiler drum after temporary installation, the axis of the crawler crane station vehicle is not aligned with the position of the drum, thus avoiding collision between the drum and the crane boom.

[0016] The above-mentioned method for hoisting a high-temperature and ultra-high-pressure boiler steam drum after temporary installation involves arranging the steam drum hoisting position along the front and rear direction of the boiler, thus shortening the steam drum hoisting path.

[0017] The above-mentioned method for the temporary installation and hoisting of a high-temperature and ultra-high-pressure boiler drum involves using two 6x37-Φ47.5 steel wire ropes, each 12.1m long, at the temporary installation position of the temporary installation beam and the drum; two 6x37-Φ47.5 steel wire ropes, each 14.4m long, at the upper part of the permanent hoisting beam; and two 6x37-Φ34.5 steel wire ropes, each 13.5m long, folded in half, at the contact points with the drum. Two connectors of one steel wire rope at the upper part of the temporary installation beam and the permanent hoisting beam are connected to the two folded sections of the two steel wire ropes at the bottom of the drum using two 25t shackles. Similarly, two connectors of the other steel wire rope at the upper part of the temporary installation beam are connected to the four connectors of the steel wire ropes at the bottom of the drum using two 25t shackles.

[0018] The beneficial effects of this invention are as follows: using a crawler crane as the steam drum hoisting machinery reduces the investment cost of construction machinery and lowers the safety risks during the hoisting process compared to traditional construction methods; it avoids the need for a temporary installation platform inside the furnace, greatly shortening the construction period and eliminating dust and noise pollution during operation, making it more environmentally friendly; and it utilizes a temporary hanging beam as a tool for positioning the steam drum, avoiding the need for the steam drum to be moved forward using pulley blocks, making the hoisting process safe, fast, and economical. This invention's method uses a crawler crane for single-machine hoisting and temporary placement outside the furnace, increasing the quality control points during installation: no temporary platform or steel beam is needed inside the boiler furnace, and the installation of the steam drum can only begin after the verticality of each layer of steel frame has been inspected and approved; the step-by-step, segmented acceptance mode allows engineering technicians to better and more conveniently control various quality elements, improving the level of construction technology. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the unloading of the steam drum according to an embodiment of the present invention;

[0021] Figure 2 This is a front view schematic diagram of the steam drum hoisting according to an embodiment of the present invention;

[0022] Figure 3 This is a side view of the steam drum hoisting elevation according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram illustrating the completion of the temporary hanging process in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the temporary beam hanging system according to an embodiment of the present invention.

[0025] In the diagram: 1. Temporary hanging beam, 2. Official hanging beam, 3. Pad plate, 4. Hook plate, 5. Support beam, 6. Reinforcing rib plate. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] This embodiment discloses a method for the temporary installation and hoisting of a high-temperature and ultra-high-pressure boiler steam drum. The method includes a crawler crane for hoisting the steam drum into position and adjusting its elevation within a certain range (raising and lowering); a temporary beam system for temporarily installing the steam drum and ensuring the stability of the entire system; a tower crane for hoisting the load-bearing crossbeams and the permanent steam drum lifting beams; and a hand-operated hoist for adjusting the steam drum elevation. The steam drum is hoisted from the outside of the boiler using a single crawler crane. Temporary beams are positioned close to the crawler crane, while the permanent steam drum lifting beams are installed further away. After the steam drum is hoisted to its designated elevation, the tower crane installs the temporary beams. Following the temporary installation, the permanent lifting beams are installed, and the final positioning of the steam drum is completed using the crawler crane and hand-operated hoists.

[0028] Specifically, the steps include the following:

[0029] Step 1, Selecting the working conditions of the crawler crane: Select the length and angle of the crawler crane's main boom based on the height of the boiler steel frame; select the length of the crawler crane's auxiliary boom based on the location of the steam drum; and determine the crawler crane's super-lift counterweight based on the weight of the steam drum.

[0030] In this embodiment, the total lifting weight of the steam drum is 104.047t, the crawler crane main boom tilt angle is 85°, the center counterweight is 0t, the tail counterweight is 100t, the main boom is 54m, the auxiliary boom is 24m, and the superlift counterweight is 120t.

[0031] Step 2: Assemble the temporary beam system on the ground. The specific structure of the temporary beam system is as follows: Figure 5 As shown, the length of the temporary hanging beam 1 is determined according to the distance between the adjacent beams of the steam drum, the specifications of the temporary hanging beam 1 are determined according to the stress condition of the temporary hanging beam 1, and the height of the support beam 5 is determined according to the height of the adjacent beams of the steam drum. Two steel wire ropes are fixed at the temporary hanging position of the temporary hanging beam 1 on the steam drum. A reinforcing rib plate 6 is set at the temporary hanging position of the steel wire rope, and a pad plate 3 is set on the upper part of the temporary hanging position of the steel wire rope to make the load evenly distributed and facilitate the unhooking. A hook plate 4 is set on the outside of the pad plate 3.

[0032] Step 3: Unload the gas cylinder onto the ground and move it to the designated location, such as... Figure 1 As shown, the steam drum transport vehicle enters the furnace front passage, and the steam drum is unloaded to the furnace front position, shortening the high-altitude positioning path of the crawler crane.

[0033] Two steel wire ropes are fixed at the temporary hanging position of the steam drum and folded in half for use. A platform passage is erected on the top of the steam drum. To ensure the passage for the steam drum hoisting, the right hanging beam of the steam drum boiler is installed slowly, and the main beam and columns above K1G745.6m are installed slowly.

[0034] Step 4: Operate the crawler crane to vertically lift the steam drum to the appropriate height, and then slowly climb the boom to the predetermined installation position of the steam drum. For example... Figure 2-3 As shown, the crawler crane first lifts the boiler with a small radius, passing over the front beam of the furnace to avoid insufficient height. After passing over the front beam, it slowly climbs the boom to the position of the steam drum.

[0035] Step 5: Hoist the temporary beam from Step 2 into place. After the temporary beam is hoisted to the designated position, weld the supports and diagonal braces of the temporary beam.

[0036] Step 6, Temporary Installation of the Steam Drum: Connect the wire ropes on the temporary installation beam 1 and the steam drum together to form a single rope, ensuring even stress distribution. The upper part of the temporary installation beam 1 uses two 6x37-Φ47.5 wire ropes, each 12.1m long. The upper part of the permanent suspension beam uses two 6x37-Φ47.5 wire ropes, each 14.4m long. The contact area with the steam drum uses two 6x37-Φ34.5 wire ropes, each 13.5m long, folded in half. The two connectors of one wire rope on the upper part of the temporary installation beam and the permanent suspension beam 2 are connected to the two folded sections of the two wire ropes at the bottom of the steam drum using two 25t shackles. The other wire rope on the upper part of the temporary installation beam... The two connectors and the four connectors of the bottom steel wire rope of the steam drum are connected with two 25t shackles. (The four ends of the steel wire rope on the main hoisting beam and the four ends of the steel wire rope on the steam drum are connected together to form a single rope, ensuring even tension.) Additionally, two 6x37-Φ34.5 steel wire ropes are pre-fixed to the steam drum at the contact point with the steam drum and hoisted together with it. A 6x37-Φ47.5 steel wire rope is fixed to the upper part of the temporary hoisting beam with wire and hoisted together with it. The temporary hoisting of the steam drum is as follows: Figure 4 As shown.

[0037] Step 7: Using a hand-operated hoist in conjunction with a crawler crane, adjust the longitudinal and transverse center lines and elevation of the steam drum to position it. After installing the formal lifting beam, the steam drum is officially positioned.

[0038] Before the temporary beam is placed, mark its position on the boiler plate beam to avoid collision with the steam drum's main lifting beam. The crawler crane's centerline should not be aligned with the steam drum's placement position to prevent collision between the steam drum and the crane boom. The steam drum lifting position should be arranged along the front-to-back direction of the boiler to shorten the steam drum lifting path.

[0039] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A method for hoisting and constructing a high-temperature and ultra-high-pressure boiler steam drum after temporary installation, characterized in that, Includes the following steps: Step 1, crawler crane operating condition selection: Select the length and angle of the crawler crane main boom according to the height of the boiler steel frame; select the length of the crawler crane auxiliary boom according to the position of the steam drum; and determine the crawler crane super-lift counterweight according to the weight of the steam drum. Step 2: Assemble the temporary hanging beam system on the ground. Determine the length of the temporary hanging beam based on the distance between the adjacent beams of the steam drum, determine the specifications of the temporary hanging beam based on the stress condition of the temporary hanging beam, and determine the height of the support beam based on the height of the adjacent beams of the steam drum. Fix two steel wire ropes to the temporary hanging beam at the temporary hanging position of the steam drum. Install reinforcing ribs at the temporary hanging position of the steel wire rope and install pads on the upper part of the temporary hanging position of the steel wire rope to distribute the load evenly and facilitate unhooking. Install hook plates on the outside of the pads. Step 3: Unload the steam drum onto the ground and move it to the designated location. Fix two steel wire ropes at the temporary attachment point of the steam drum and fold them in half for use. Also, set up a platform passage on top of the steam drum. Step 4: Operate the crawler crane to vertically lift the steam drum to the appropriate height, and slowly climb the boom to the predetermined installation position of the steam drum. Step 5: Hoist the temporary beam from Step 2. After the temporary beam is hoisted to the predetermined position, weld the supports and diagonal braces of the temporary beam. Step 6, Temporary hanging of the steam drum: Connect the steel wire rope on the temporary hanging beam and the steel wire rope on the steam drum together to form a single rope so that the steel wire rope is evenly stressed. Step 7: Using a hand-operated hoist in conjunction with a crawler crane, adjust the longitudinal and transverse center lines and elevation of the steam drum to position it. After installing the formal lifting beam, the formal positioning of the steam drum is completed. Before the hanging beam is in place, mark the position on the boiler plate beam in advance, and avoid the position from colliding with the steam drum formal hanger beam; The tracked crane's centerline is not aligned with the position of the steam drum to prevent the steam drum from colliding with the crane boom; The steam drum lifting position is arranged along the front and rear direction of the boiler to shorten the steam drum lifting path.

2. The method for temporary installation and subsequent hoisting of a high-temperature and ultra-high-pressure boiler steam drum according to claim 1, characterized in that, The temporary suspension beam uses two 6x37-Φ 47.5 steel wire ropes, each 12.1m long, at the temporary suspension position of the steam drum. The upper part of the permanent suspension beam uses two 6x37-Φ 47.5 steel wire ropes, each 14.4m long. The contact area with the steam drum uses two 6x37-Φ34.5 steel wire ropes, each 13.5m long, folded in half. Two connectors of one steel wire rope on the upper part of both the temporary and permanent suspension beams are connected to the two folded sections of the two steel wire ropes at the bottom of the steam drum using two 25t shackles. Two connectors of the other steel wire rope on the upper part of the temporary suspension beam are connected to the four connectors of the steel wire rope at the bottom of the steam drum using two 25t shackles.

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